Threaded – headed fastener – or washer making: process and apparat – Process – Making headed fastener – e.g. – rivet or nail – etc.
Patent
1997-06-03
1999-01-19
Hail, III, Joseph J.
Threaded, headed fastener, or washer making: process and apparat
Process
Making headed fastener, e.g., rivet or nail, etc.
470 27, 470 38, 163 6, 72 47, 72703, B21G 300
Patent
active
058608664
ABSTRACT:
A steel pin is disclosed of a type to be forcibly driven into a steel substrate by using a powder-actuated tool. The steel pin has a substantially cylindrical shank, and a substantially sharp point which extends from one end of the substantially cylindrical shank, which conforms substantially to a tangent or secant ogive except for a substantially spherical tip having a radius in the range of approximately 0.015 inch (approximately 3.75 millimeters) to approximately 0.03 inch (approximately 7.5 millimeters), which has substantially true concentricity, which has surface-texture irregularities with a roughness-height index value not greater than approximately 30 microinches (approximately 0.76 micrometers), and which appears to be substantially free of other surface imperfections when viewed under 60.times. magnification. Optimally, the ogive is a tangent ogive with an ogive radius approximately ten times the shank diameter and with an ogive length approximately twice the shank diameter, and the tip radius is approximately 0.1 times the shank diameter. The substantially cylindrical shank is joined to the substantially sharp point at a transition having a substantially smooth, continuously curved surface, and which is knurled near the transition. The steel pin is made by deforming a length of steel wire, as by forging or swaging, so as to form the steel pin.
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Heflin William M.
McConnell Ronnie L.
Syvarth James H.
Van Allman Don T.
Hail III Joseph J.
Illinois Tool Works Inc.
Tolan Ed
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